如果 test 的值 value 为真,那么结合 binding-form 绑定,对 body 进行求值。
test
value
binding-form
body
user=> (defn drop-one [coll] (when-let [s (seq coll)] (rest s))) #'user/drop-one user=> (drop-one [1 2 3]) (2 3)
vals
when-not
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